Grinding-machine.



W. D. GHERKY.

GRINDING MACHINE.

APPLICATION FILED Nov; 9, 1911.

Patented May 5, 1914.

7 SHEETS-SHEET 1.

W. D. GHERKY. GRINDING MACHINE.

APPLICATION FILED 1101 .9. 1911.

1,096,005. Patented May 5, 1914.

7 SHEETS-SHEET 2.

W. D. GHERKY.

GRINDING MACHINE. .APPLIOATION rILEn ov 9, 1911.

- 7 SHEETSSHEET 3.

0 z/mm Patented May 5, 1914 w. 1). GHERKY. GRINDING MACHINE. 'APPLICATION IILED NOV. 9, 1911.

*Patented May 5, 1914,-

z w w W. D. GHBRKY.

GRINDING MAOHINE.

rum-n02: rmzn nov. 0. m1.

Patented May 5, 1914.

I SHEETS-RESET I.

- tollowing conditions: to be compact, --self-' nn gnnr OF C -f5}? WILLIAM D. 0F PHILADELPHIA,PENNSYLVANIA.

V GRINDING-MACHINE.

To all whom cit may concern Be it known that I, JVILLIAIir D. GHERKY,

a citizen of the United-States, residing at. Philadelphia, in the county of Philadelphiaand State of Pennsyly ania, have invented certain new and useful Improvements in Grinding-Machines, of wh1ch the following invention relates to g'i-ndi-ng mathose designed for es, and especially to It has for its object the production. of a machine of this class capable of meeting the contained, and within the power of manipulation of one or two men; i o grind either or both rails of a track simultaneously, at will; to be self-propelled and self-governing, so that when set itwill automatically travel back and forth over any selected portion of the rail within a distance predetermined by its own adjustment; to be self-regulating and self-feedinginrespect to the eut,.2'. e. the depth to which the rails will be ground, the feed being direct and reversed so as to give automatic running-on and running-0E or tapering of a cut; to permit ready and. accurate ad ustmentof each grinding wheelto gompensate for wear irrespectiveof its to permit the quick fee or operating travel; and easyreplacement' of grinding wheels when desired; to be readily and quickly'detachable from a rail at any point in its operation, movable therefrom to permit the. pasand instantly returnablethereto without loss of adjustment orposition in its further operation; to be readily converti- I a straight cut, or any desired combination of the two; to be; gage of track; to be batsage of a car,

ole from a tapered cut to adjustable to any in the design of each or vibration; transported on road 7 power; to be free from danger to the operator in its ordinary manipulation, certainy v I i 1 determmed by the permissible variational:

' economical and eilicient in its action.

Stated in structural terms the invention which I hereby present and ineets'the foregoing conditions as lows: I provide a a truck upon 'which are mounted a motor, drive and counter shafts, reducing gears, re-

Specification of Letters Patent.

ding thesurfaces of railway rails inv -ll Ce.

free from noise. to be raised, suspended, andwheels by relatively low peripheral speed at attains my obj-ectfol-'- duplex grinder having asubstantially square steel frame constituting versing motions, adjustable flanged tmolci wheels, double swung and doubly adjustable vertically feeding grinding wheels driven from the motor, reversible transmission gear vfor producing oscillating travel of the truck on the rails, hoisting and suspension gears and a trolley pole with connections for sup-v plying power tothe motor where the latter is electrical, or a'suitable source of energy supply when the motor is of some other type. In addition-to these parts, which are all compactly arranged upon the truck frame, a pair of road wheels of large diam-- eter is provided, connected to the frame by hoisting mechanism so arranged with suitable gearing'that the machine can be hoisted upon these wheels and the wheels turned by relatively small power.

The grinding wheels are run separately so -as to grind either one or both of the track rails of a pair ,at will and each is separately detachable from the power mechanism, as wlplll as separately and individually adjusta e.

In order to be self-propelling and selfgoverning, the machine is provided with gearing connecting the motor to the track wheels through clutch mechanism, and a timing mechanism is also connected tot-he motor'end driven thereby controlling the clutch mechanism so .as' \toproduce direct and reverse .act1on on the "driving wheels alternately; ithe time ,o if action being determined by ,the adjustment of the operating connections between the timing mechanism andthe clutch. The grinding wheels are" rendered selfrfeeding by connecting the .tim-J I PatentedMay'5,1914;, Application filed November 9, 1911.. Serial No. 659,456. i

ing mechanism with anadjustasble actuating member engaging a spring pressed,crad1e carrying each wheel. wear on the wheels, each wheel is. mounted in a vertically adjustable member pivoted- To compensate. tor I on its cradle and adapted to he locked thereon when set, so as to move with the-{cradle during the fee To permit the ready replacementof grinding WghGGlS,

each wheel is for 1 ned;asi a=-- ring, the grinding. material of ,a radial depth c u a iven masher of rotations, 'each-ring heillg clamped in metal;

huh plates adapted tof-he. readily v slipped o and eat of the c dl s v o permit the machrne from the rail at any, point ,ats 'QP8I5tt1OI1 to he removed and replaced thereon at precisely ithets'amez roeaoos the motor 9 and its connected parts. This machinegbemg antended'ifor use, on electric roads,- anelectnemotor is employed, the de:-.T

ta i-ledconstruct-ion of which" forms, no part o fthe;zpresent invention, but'whichdrives a shaft 10,;provided with suitable out-board bearings and driving a suitable train. of re:

ducing gear-s shown for simplicity as a worm 11, meslnng with a worm-gear 12,.wh1ch 1s fixedzn'pcn a='driving shaft, 13, from which powerzis taken to propel the machineon the tracks, and to feed the grindingiwheels to be presently described.., 011 its opposite ends he motor shaft 10 carries belt-pulleys 14, 15, from which power is directly communicated to similar pulleys 16, 17 on the grinding. wheel spindles. Aswill presently appear, the grinding wheels are capable of lateral adjustment in the frame to accommodate tracks ofdifferent gages,-and to permit this adjustment without interfering with the I drive, the'belt-pulleys, 14, ,15, on the motor .pair of travelers, 20, 21. The

shaft are given endwise adjustment, as indicated in dotted lines.

The machine is supported upon the track rails by a pair of track wheels, 18, 19, and a track wheels are splined or otherwise secured for longitudinal adjustment on an axle, 22, having end-bearings, 23, 24, on the frame. The travelers, 20, 21, are secured directly beneath the ends of the cradleswhic'h carry the grinding wheels, and are laterally adjustable therewitlnso that all adjustments for gage are parallel and can be made accurately without any danger of throwing the parts I out of, line.

' axle,

The grinding wheel drive is always in the same. direction, but in order to run the machineback and forth over the section of the rails, tobe ground, a reversible drive is requir ed .for' the track wheels and their axle,

and this is provided in the following mannerz The driving shaft, 13, carries a pinion,

25, which meshes with a gear-wheel, 26, on a,

shorti shaft, 27. This shaft carries a pinion,

- 28 which meshes with a gear-wheel, 29, on a shaft, 30. The shaft, 30, carries .a mitergear, 31, which meshes with companion miter-gears,- 32 and 33, traveling loosely in opposite directions upon the axle, 22, and adapted to be coupled thereto alternately by means of a; sliding clutch, 34, controlled by a fork, 35,' on. a swinging lever, 36, pivoted at 3,7 to the frame member 4. Withth1s arrangement, by swinging the lever 36, inone 7 direction, the, gear 32 will be coupled to the andthe machine will be slowly driven along-the track'through any desired distance. By then reversing-the throw of the lever 36,;the gear 32 1s disengaged, andthe 7 gear 33; coupled to the axle, so as to reverse .the'inotiongofthe machine by driv ng t he track-:wheelsp18, 19, intheoppos te d rection: This reversal is made automatically,

cording to by means which are adjustable to permitany desired travel or amplitude ofoscillationbf- Fthe'm achme as a whole. These means-are as w; follows :Ashdmg bar-38 has a central slot j 39 through which the lever-"36 passes. .It

also has at one end a'slot 40,:i'eceivin'g a pin 41 on the lowerarm 42of a bell-cranlrlever.

whose upper arm .43ihasits end 44 projectmg through-a slot 45 in the-lever .46 pivoted l at 47 to the frame, and oscillated up and connection 48 on a rocker-arm 4.9 secured upon a short shaft 50 carried in bearings 49 and which also carries a toothed segment 51 secured to a hub 52 and driven by a pinion 53 on one end of a shaft 54, which carries on its other end a-gear-wheel 55 meshing with a pinion 56 fixed on a loose sleeve 57 adapted down by means of an adjustable wristpin to be coupled to the axle 22 by means of a clutch 58 having its sliding member 59 splmed on the axle and worked back and forth by means of a fork 60 on one arm of a I bell-crank lever 61, the other arm of which is connected by means of a link 62 with a rocker-arm 63 on a shaft 64 extending clear across the frame, and having at opposite sides thereof vertical hand-levers 65, so that the clutch 58 can be thrown in or out of engagement by hand from either side of the machine. The operation of this part of the machine is as follows: Power being colnmu- V bell-crank, 43, and after a certain amount of travel of the pin, 41, on the arm, 42, in the slot, 40, '(Fig. 2) the sliding bar, 38, is moved to shift the clutch-lever, 36, so as to disengage the clutch and startit to reverse. To make this reversal certain, and also to per mit intermediate travel of the parts between reversals, I provide a weighted, lever, 66,

pivoted on the frame at 67 at its lower end,

and also pivoted to the bar, 38, at 68, without lost motion. The weight on the lever is indicated at '69, and these parts. are best shownin Fig. 2 -W'hen the pin, 41, on the bell-crank, 42, reaches the end of the slot, 40, in either direction, it pushes the bar, 38, and with it the weighted lever, 66, until the latter goes ipast center, whereupon the weight, 69, in falling, will carry the lever, 66, to the end of its stroke, pulling with it the bar, 38, and

completing the movement of the clutch parts,

36,35and 34.

that when the segment, 5l,"is in its inter- The parts thus described are all so related erably are made V to the lowestpoint,I and ill-swinging to the other end of its travel will raise it again,

a p grinding wheel'is determined always with -respectto the normal surface of the rail and "on a-"siznila-r "wristpin, 108, carried on a it 1. 1,105; and 109, andby adjusting theseblocks in and out, the amplitude of oscillation of the .pins 106 and 108 may be accurately dey terfiiiined. Han-d wheel 10S) with'the travel of the m chine in one direccide pe ectl y f with. the; ampli udeo it isonly necessary to'properly connect the shaft,[103,'to'the rerersingm'eans,

upon it, carrying awristrocker-arm," 109, which is fixed upon the sh'aft,.- 50, carryingthesegment, 51. Both the wristp1n s,' 106 and 108,'1n ay be and preflocks and screws' si1ni F0 19; in .theirrocker arms providing sliding to 48 49 of arm is connected to its screw by n iter-gears iii order'to clear .the

' 'therefore'tojbe g arin v It should be borne 1n mind that the'seginent 51" 1S slowly rocked up and down as the machine travels back and forth. Each oomplete movement of the segment up cr'down before reversin re res nts and coincides 'tion. 1 The rocker-arms, 109, and 102', are 'setupon their shafts with respect to each other, so that the arm 102, will 'startfrom.

cine end of it's travel push the cradle down movement of'the segduring one complete 'In other words as" the ment 51 up or down.

machine. starts froni'onc end of its travel and progresses along-the track, the grinding wheel will be. slowly fed down until: it reaches the deepest part ofthe out; and then fill. be s lowlyffed up again to reach'its'upp'ermost position at,,. the same moment. that .the machine reaches the end of its travel and starts torever'se, .the reversalbeing brought about it will beremeinbered, by the action of the clutch 34in'Fig. 1-. 1

The accuracy. of the cut made by the 1 this determination no account can be ties, as otherwise the grindingwheels would inequalities; ,To and to afiord kept alwaysinli-ne with the grinding w el f tra'vel of the. maehine,

driving'gear, withlsuitable andvrhis'isdone inthe fol-. lowing ma nner; The shaft,f103, has a rockerarm, 105, fixed I 100, upon which isqpivo ted one end of *a 11111:,107; the; other end of which is pivoted.

of the cradle. member- 8 corrugation or ordinary-track depre sio (so support 'upon the.

adjustable radially with vph1rali-ty of.rollers;indicated at 20, and

' respect to the shafts 'onwhich-they are fixed I to be. especially notedcthat .'a},,.si ngle roller would be inoperative for my purpose; -as' it. wouldf'afiord onlya i invention; and I clainr the; same actances between centers,

.consider this also my invent-ion,

drive which can waves or depressions, I provide the eX- t nd d: eater. cated 'on the th traveler is. to the "seine shaft- 88 which snpports the mails laterall adjfistable with so" trackvvlieels; inaybeheregstated ra remnyrogemee;

pp r scheisrlie t The traveler'i20-i s' ma longeffthan aiiy ,s0 as tobrldge the same'fandieifectfan' extended I average or-norrnal surface of'the-rail; [The traveler mayslide directly w on the rail, but'I prefer to provide it with 85 one or more 'ofc these rollers may. be fitted with flanges as indicatedat 20 forthe'pur-' pose. of maintaining alinement on thefrails;

I 9b e p mt r transverse line-joflcontact' with the rail I consider-this extend d plurality "bf rollers important 'feafi 'Qof-my cordi ngly y Anothenpoint to: nailed. with respect the travelenflll; is its to the, grind ing] wheel, relative' to 1 theispacingiofthe" latter from that-rack wheels. The latter-have no extended contactfwith the.'rai1, .but inas-' 4 much as the -efl'ect of the traveler 20 and the.

"track wheel. 18 upon theadjustment of. the

grinding wheel-80, is inversely asltlie {disany effect produced wheel may be regarded as -negto my method of spacing.; .-;I

an. important feature of especiallyjn this combination self-contained machine; in which "the sup- 110 ports on the rail are of a composite character, that is to say composed in part of propellin'g track wheels, and} in part of cutdetermining-travelers. 1 J The foregoing descriptioncovers-the operating parts ofthernachineg- There is still another feature however, of greatimportance, whi h remains to be-described vizl, means. for independent-1y,asupportingf 1.the machine and'removin'g itgfrom and replacing it upon the track-'4.- This means-rornprises a hoist, apair'of road wheels,;and a-power first be. applied to the-hoist and 'thento the road lwheels, rendering-it a possible by small power to handlethe-entire' machinee remove and replace it, which {so far as I all! awarehaszneverbefore been; accomplished." Rising from OPPOSlt I sides 105 by the track ligible; due

verse action up and down;

'- the difi'erent elementsinentioned,- to henovelarid original with me and shall claim t-g-aged by v v 4 hoisted omtlie wheels :122 an afiaan e e noeegooa the same accordingly i The mechanism for turning the "Windlass comprises: a pinion 1454:,-

shaft" 1&5; which is iournaled in bearings 1 16 the hub 123 of "gear-wheel 14:8 meshing he; pinion 144 to a drum which there-,is in, .Fig'. To engagenotch the detent' when when-the iwindlass and rpartsgarel hoistedon themachine'f When-the disk' is a wheel 154,

- detent 152 engages the notch locked. Continued shaft will new result in rotating the pinion,

- 152; a The .is in neutral position,th'at isto-say wit wagon wheelsand trackwheels on -a leve'l as-i thisnotch-i'is dia 2 dog" in the same notch-. Secured 'to the Windlass sleeve,

is a friction disk 153, and outside of this oted on the box 131, as is also I ratchet wheel 15 1-"is locked be tween the drum 149, friction due to the engagement clutch 156, which in itself formsr'no'part of the present'invention, but is an important 1 element in the combination employed;

In the drawing, I have shown the crankprovided -With an extensible portion:

135*, pivoted s'o-it can be swungin either direction; to make the crank long for working the Windlass, and to make it short for turning the wheels 122' and 12 1. It should be noted here that the pawl 155- is never lifted. The operation of these parts is Assuming that the machine is resting on the as follows:

rails,-and it is. desired to move it, thewheels 122 and 12-1 being hoisted up. The dog 152 is'first 1ifted,- and the crank turned to rotate the gear-Wheel 148 so as to unwind the chain on'the Windlass, whereby the wheels Continued operaand axle are. lowered.

tion .of the crank then winding of the Windlass, so as to lift themachinebodily, and when this has been accomplished, the 151 in the drum, and the parts are automatically rotation of the crank produces further 144; and the crank-shaft'145, in planetary fashion around'the gear-wheel 14:8, and as.

as embodied in chine may be expeditiously rolle h to ren'ioreHt-from' the fixed on the crank notch "151, i as. best vided,and .1

notch, while a 141, outside of the-box 131, I

having on its periphery ratchet teeth engaged 'by apawl'155 piv-, the. detent' and thedisk 153,- by, or the -screwthe machine so as chains on both ends of the road wheel-12 1'isgfiaed'to the pinion. bearings; it is turned alse,; a'ndjwith it the axle 121 and the';'wheel-'122 "Thusfthe mac angles to the track.

path of an oncoming car; To replace'the machine, the crank-motion is-iirstreversed' a at right so as to reversethe -planetary gear efieem and turn the direction to again the track rails.

wheelsQ- l225and 124:, inreve'rse- 'ng ythe machine over 'Ehediig 1-52..is then litteda i and the crank lows rotated-backward to continuouslylkeefi cli'itch'parts 14:8,

1&9 sufliciently uncoupled to "permit .the

.iwin' dlassto turnslowly andldwer the mathe track, In'so doing, the crank am fly around, nor the machine be 43;: led"suddenly as any stoppage in the may be conveniently attached- '-;to [the rim ofone ofthe road-wheels, as 122,

rererse'yrnotion of the crank will result in tiously locate the machine over the rails after thesaime has been rolled aside to permit the passage of a'car. road-Wheels in practice make revolution to clear-the car, the chock may Inasmuch as the,

but half a remain on the road-wheel except whenthe machine, is being transported .over a dis tance greater than its circumference. r

Connected to the sleeve 132 by a handwheel friction clutch 160 is a winding drum 161. Thepurpose of this drumissto win'dg up a cord 162 attached to the trolley pole of n -tomatically when the machine is being hoist to draw down the pole an ed on the axle to permit an approaching car 7 to pass. in Fig. 4:, the cord 162 e-Xtendingto a suitable sleeve 168 on'the pole 164:, which has at one end a fork 1'65 (or trolley wheel) to engage the trolley wire, and is secured near the other end in a-sleeve 166 pivoted at 16? to the post 168; Outside or the sleeve a cap 169-is fitted to the end of the pole and carries a T-head 170 with its ends projecting transversely to the pole, and each of them receiving a hook of springs-172, theother ends of which are secured to cross head 173 secured by means: of a set screw orsimilardevice 17 4: on thediagonal brace 17 5 which is secured at its lower end The trolley pole rigging is shown 171" on the end-of one of a pair the oppositelendsof a sliding-g in a cast iron socket 176011 the' nachine,

bridge 120 and bearing sleevelTt' in which thepost 168 can turn." The foot of the post journaled in a cast 7 is received and, iron socket-178 secured carries at its other-*enda.

on the bridge member 120 ot themachine.

CJI

function is to cushion the suspension of the machine",fromsthe wheels 122 and 124: by suitable means interposed between the axle boxes 131,131, and the upper ends of the vertical suspension frame 7--7 8-8 120. Supposethdmachinehas been hoisted, so

Y that the vertical frame pieces 7-4, 8-8

have risen, with respect to the axle boxes 1231, 131 obviously the space in each vertical slot between the axle box and the head or bridge member 120 will be much higher than normal. Into these spaces the boxes 186 are inserted, one on each side, and in order to prevent lateral displacement of the boxes under strain, suitable holdin means.

may be provided therefor, in the sliape of flanges or pro ectlons, either on the-spring boxes or the axle boxes, or on the frame.

' The detent 152 may then be disengaged from and -provided with bolt holes.

the slot in the drum 149, and a few backward turns of the crank handle will impose the entire weight of the machine on the springs in the boxes 186, and the general arrangement will at once become quite similar to that of the frames and journal boxes on a railway truck. A. great advantage gained by this arrangement is that the line of support for the entire weight of the machine is at its highest part, that is along the bridge member 120. This tends to lessen oscillation.

Means for transporting the machine are shown in -Fig. 6, the arrangement being such that while the tractile force is applied i-collar 188. The ends 187 and 188 are se- 'c-ilred by a throughbolt with the head of a draw bar adjuster or link 189 between them.

The lower end of this link is provided with a number of bolt holes by which it can be adjustahly secured between a pair of cars on the frame: member 3 or 4. The ends 187 and .188 project and are provided with bolt holes .for the attachment of a link or other means for connecting the draw bars to the r ar end of a wagon or truck or to a swinglctree .for'ldirect hauling. Thus, with the spring suspension and steadyinglink, the machine-maybe transported any distance with ease andsecurity.

The method of control and the crank method of feeding. that is to say of regubiting both the r vel 5f the marina 5nd, the depth of cut of the grinding wh b hi h I have described, embody'features-of?in ven f' tion not found in machinesheretoforefsu'g" gested or in use. In additiom it shouldbefl particularly noted that the two cranks- 9 370 and 109 are keyed to the same sl1aftf 50,'- whereby their relation to each 0ther is-defi--jj nitely fixed and theircooperation' is".tliere fore not dependent upon the? exact timing of independently acting agencies. lathe lat-"i575- tercase, any variation in thetime'and travel 1 of the machine, or the time of'feedj ofjthe' grinding element would result eitlr'er'-in'a9; reversal of travel without perfect runoff ij or taper, or in carrying th'e" grindingele Q-SO ment too long out of"contactwith'the rail before reversing the trav'elJ- Having-these two cranks on one shaft" also permits 't-he use of one simple clutch 58 for controlling" both feeds simultaneously-and conveniently, as'in passing from joint to joint or in workf ing on corrugations.

It has heretofore been stated that; the" grinding wheels used. in' this machine are no more than rings on metal hubs. Figs"? and 5 showthe construction of the wheel and hub. The hub is composed of apairof matched plates as shown in section in Fig. 5, each notched around its periphery to form an annular channel, withan inwardlyleaii ing flange. hen these two plates are p'ut together they form a circular dove-tail to receive the wheel, and they are secured 'to-' gether by bolts as shown in Fig. 5. When a wheel becomes worn, the upper member of the cradle is lifted up to diseiigage its adjusting screw, the caps of the bearings are loosened, and the. old wheel is then slipped out, its plates separated, a new ring of abrasive material clamped in the dove-tail between them, and the latter then slipped into place in the cradle, which is readjusted for the new diameter thus created. In practice, several pairs of hub plates are provided with each machine, so that spares may bejxllO kept loaded ready for insertion without de lay when a wheel becomes' worn and it has to be removed. I, w

It will be noted that in Fig. 3 just to the rightof the grinding wheel 80, thatisgto say. behind the wheel, which rotates incoun terclockwise direction whei'i viewed fin 3*, Iprovide. a thin iron shield 86 ,jwithj 'a flexibleasbestos end 86 i-ivetcl to itf jThisf sweeps the rail behind the emery wheel(in the direction toward the driving :w h e'eh)? I and inoperation all of the whitdihbjtyse ni f moltenmass due to the grindingfaicpiiinulatesff against the asbestos, and mayoccasionallyf'.

be hooked out with an iron tool -provided" for that purpose. I am aware that many'cha'nges' and 'i'nodifi cations may be made inthis machine withand accurately determine its alinement with respect to the rail, a'grinding wheel carried I on the frame in proxin'iity to s'aid traveler,

jointly and reciprocally varied at will in a means mounted on the frame to'drive said grinding wheel, means also mounted on the frame for driving said track wheels, means for, reversing said drive, a timing device controlling said reversing means, means for feeding the grinding wheel, anadjustable WOIkiIlgCODIlGCtiOIl from the timing device to said feeding means, and another adjustable connection between the timing device and the track wheel drive, whereby the depth of cut and the length of cut may be predetermined manner. 1

8, In a machine of the character described, a truck frame adaptedto travel along a track Way, with single contact supports at one end, and a traveler rigidly connected to the other end at one side of the frame and having an extended bearing on the rail surface longer than any rail corrugation to be ground, said traveler forming the complete and sole support of the frame at its end, and agrinding element mounted on the frame close to the traveler and in position to en gage the same rail of the track Way.

9. In a machine of the character described, a truck frame adapted to travel along a track way, with single contact supports at one end, and vertically adjustable travelers attached to and constituting the sole support of the frame at opposite sides of the other end, each traveler having an extended bearing on the rail surface longer than any rail corrugation to be ground, and a grinding element mounted on the frame close to one'of said travelers and adapted to be brought into engagement with the same rail asdetermined by the adjustment of said traveler, together with means to drive the grinding element.

10. In a machine of the character described, a truck frame adapted to travel along a track way,-an axle at one end thereof carrying propelling wheels adapted to travel on said track way, means to drivesaid propelling wheels, and vertically adjustable travelers attached to and constituting the sole support of the frame at opposite sides of the other end, each traveler having an extended bearing on the rail surface longer than any rail corrugation to be ground, and

a grinding element mounted on the frame close to one of said travelers and adapted to be brought into engagement with the same.

rail as determined by the'adjustment of said traveler, together with means to drive the grinding element.

11. A machine of the character described comprising a main truck frame, auxiliary ,derailing wheels thereforby which the ma.-

chine may be transported from the trackway,

hoisting mechanism between the main truck frame and said auxiliary wheels, a single set of t'ack supports forsaid main truck frame adapting it to travel along a trackway, said supports being permanently in position to engage said trackway when said main truck frame is lowered to the trackway from said, auxiliary Ywheels'fo'ne of said supports at oneend of the main truck frame having an extended bearingtonf said trackway greater in length than the length of any corrugation to be ground "out, and another of said supports at the other end of: said truck frame having a'propelling wheel. and a grinding wheel mounted on said frame closely adjacent to saidfirst named support.

and removed from said second named sup-' contact with the rail, and acting in con]unc tion with said driving wheel to carry the entire weight of the frame and parts thereon over and resting upon a rail to be ground, a grinding wheel mounted on the frame near the traveler and relatively distant from the driving wheel, adapted to engage said rail as determined by its relation with said traveler, and means to drive said grinding wheel. 13. A self-contained automaticgrinding machine comprising the following instru-' mentalities: a truck frame, a grinding wheel and propelling wheels thereon, a motor on the truck, a driving connection from said motor to the grinding wheel, a driving connection from the motor to the propelling wheels, reversing means for the latter, automatically acting means wholly for feeding the grinding Wheel "ertically up and down on the frame, and a timing device controlling both the reversing means for the propelling wheeldrive and the/ grinding wheel feed.

'14. A self-contain machine comprising the following HlStIll ed automatic grinding r mentalities: a truck :frame supported 'in' constant relation to a rail to be ground, supgrinning wheel out of engagement with thei rail, power operated means for forcmgthe same down by degreesyto the deepest pointof a cut, and for thereafter raising it gradu ally until again out of engagement with the rail, and a tuning devicecontrolling. both the reversing means and the grind ng wheel feed.

eas es erable from each of two points, one on each side of the body of the main truck.

25. In a machine of the character de scribed, a main truck frame and wheels, .a grinder mounted on said truck and supported thereby in position to engage a rail surface, a source of power, reversible transmission gearing between said source of power and the truck wheels, together with an automatic feed for said grinding element operable through saidreversible transmission gear ing.

26. A machine of the character described comprising a main truck frame and wheels, agrinding element mounted on each side of said main truck frame and adapted to operate upon the rail surface on that side, said main truck frame having a transverse shaft, means on each of its opposite ends for feeding the corresponding grinding element positively toward and from the rail surface -'1ndependently of the action of gravity, a source of power on said main truck, a re versible transmission gearing between said source of power and said truck wheels, which gear ng imparts forward and reverse mot-ion to said wheels and also operates said transverse shaft aforesaid to feed the grind ing elements verticallyi of the rail surface.

27. In a machine of the character described, a maintruck frame and wheels, a

..source of power, reversible transmission gearing on one axle of said truck comprising oppositely rotating power driven gears and an intermediate double throw clutch member splined to said axle, a rotating grinding element supported from each side of the said main truck frame, and means for synchronously and automatically feeding said grinding elements vertically to the rail surface comprising a second axle on said truck parall'el' to the first, provided with feeding means-on each end thereof, and operable thronghf-t-he forward and reverse motion of the first named axle.

28. In a machine of the character described comprising a main truck frame and wheels, a'rotary grinding element carried by said main truck frame, a source of power,

a feeding mechanism for said grinding ele ment separate from the main truck axles, transmission gearing between the source of power on the one hand and said feeding mechanism and a truck axle on the other.

:29. A rail grinding machine having a frame, track wheels thereon, a grinding element thereon, means for driving the grinding element, and means for laterally adjusting the grinding element.

30. A rail grinding machine having a frame, track wheels thereon, a grinding element thereon, means for driving the grindingelement, means for laterally adjusting the grindng element, and means for laterally adjusting the track wheels.

31. A rail grinding machine having aframe, track wheels thereon, a grinding element thereon, means for drivingthe grinding'element, means for laterally adjusting the grinding'element, means for laterally adjusting the track wheels, and meahs for adjusting the driving connection of the grinding wheel to correspond with the direct adjustments.

32. In a machine of the character described, a main truck frame and wheels, together with supporting members on opposite sides. of the machine adapted to engage a trackway and independently adjustable to the. gage, agrinding element, and means for driving the same also supported on said trucln'ai'ixiliary supporting wheels for said nain truck frame, and means whereby said frame may be suspended therefrom.

83. A machine of the character described comprising a main truck frame and wheels, a grinding element on each side of said frame in the plane of the wheels, means for independently adjusting the grinding wheels to gage, and auxiliary wheels on which said main frame may be supported together with means connecting the auxiliary wheels and the main truck and adapted for suspension of the main truck on said auxiliary wheels.

34-. A machine of the character described,

comprising a main truck frame and Wheels,

grinding element and said support whereby they may be shifted simultaneously to gage.

35. A machine of the character described comprising a main truck frame and wheels, a laterally adjustable grinding wheel cradle, and a grinding wheel and a track engaging support mounted on and movable with said cradle.

36. A rail grinding machine comprising a truck adapted to travel along a t-rackway, a

. rotary grinding wheel mounted on said truck adapted to engage and operate upon arail, means for driving said grinding wheel, and a spark guard on one side of said grinding wheel adapted to catch the material thrown from the wheel and prevent the same from lodging on the surface being ground whereby inaccuracies due to the presence of said material on the rail surface are avoided.

3'7. in a grinding machine, a grinding wheel truck carrying a grinding wheel and adapted to be propelled along a trackway with the grinding wheel in operative relation thereto, and a derailing truck associated therewith, said grinding wheel truck adapt ed to be hoisted from the trackway and supported upon said derailing truck, and a 

